The MX Zip plugin for ExpressionEngine gives you the capability to add files into into zip archive directly from an ExpressionEngine template.
The vCard plugin is simple way to generate vCards on your site.
MX Mobile Detect is a small plugin that detects if a template was requested by a Mobile Device. You also can detect Screen Resolution!
MX Ajax Detect is a small and simple plugin that detects whether a template was requested by AJAX or not.
Create QR code (bar code) images.
Locator is an application that adds new opportunities of searching locations in a set radius from the start point. You can make your Store Locator, Places of interest Locator in the region, etc.
A plugin that allows you to set and get custom messages and show them to your visitors in a way you want. E.g. Someone removed something from their shoppingcart, did an action succesfully, etc.